Na2s2o3 (aq) + 2hno3 (aq) →
a. 2nano3 (aq) + h2o (l) + so2 (g) + s (s)
b. h2o (l) + so2 (g) + s (s)
c. 2nano3 (aq) + h2o (l) + s (s)
d. 2nano3 (aq) + h2o (l) + so2 (g)

The correct answer is Option a.

Explanation:

The reaction between sodium thiosulfate and nitric acid produces a number of products. The balanced chemical equation for the reaction of two follows:

By Stoichiometry of the reaction:

1 mole of sodium thiosulfate reacts with 2 moles of nitric acid to produce 2 moles of sodium nitrate, 1 mole of water, 1 moles of sulfur dioxide and 1 mole of solid sulfur.

Hence, the correct answer is Option a.